Alert archive / Florida / Flash Flood Warnings in 1998

Flash Flood Warning 41, NWS Mobile, AL

September 28, 1998Okaloosa County, Florida

NWS Mobile, AL issued this flash flood warning at Sep 28, 1998, 3:25 AM CDT for Okaloosa County, Florida. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 28, 1998, 3:25 AM CDT (08:25 UTC)
Expired
Sep 28, 1998, 6:30 AM CDT
In force
3 hr
Issued by
NWS Mobile, AL
Area
Whole counties

County Okaloosa County, FL

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 8.4 hours before the alert went out and 221 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 1998-09-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 251 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 1998-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
251 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1039 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
0.1
Supercell composite
5.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMOB 280826
FFWMOB
FLC091-281130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
325 AM CDT MON SEP 28 1998

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  OKALOOSA COUNTY IN NORTHWESTERN FLORIDA

* UNTIL 630 AM CDT

* AT 315 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AT MOBILE
  INDICATED RAINFALL TOTALS OF 4 TO 6 INCHES IN THE LAST
  THREE HOURS WITH MORE HEAVY RAIN EXPECTED.
.

* THIS WILL CAUSE WIDESPREAD FLOODING OF SMALL STREAMS AND POOR
  DRAINAGE AREAS COUNTY WIDE.

  MOVE TO HIGHER GROUND IF FLOOD WATERS THREATEN.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING. IT IS VERY DIFFICULT
AT NIGHT TO TELL HOW MUCH WATER IS ON ROADS. MOTORISTS SHOULD NOT
DRIVEZ THROUGH WATER OF UNKNOWN DEPTH.

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 27, 8:26 PM CDTTornado WarningMOBEscambia, Santa Rosa49 min
Sep 27, 9:43 PM CDTFlash Flood WarningMOBEscambia, Santa Rosa3 hr
Sep 28, 1:02 AM CDTFlash Flood WarningMOBEscambia7 hr
Sep 28, 1:02 AM CDTFlash Flood WarningMOBSanta Rosa7 hr
Sep 28, 5:06 AM CDTTornado WarningMOBOkaloosa69 min
Sep 28, 6:00 AM CDTFlash Flood WarningMOBEscambia, Okaloosa, Santa Rosa6 hr
Sep 28, 11:54 AM CDTFlash Flood WarningMOBEscambia, Okaloosa, Santa Rosa8 hr

Nearby

Flash Flood Warnings in Florida, 1998Every flash flood warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.